[PATCH 3/3] KVM: s390: pv: Allow AP-instructions for pv guests

Steffen Eiden
2023-07-27T12:21:05Z

Introduces new feature bits and enablement flags for AP and AP IRQ
support.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
arch/s390/include/asm/uv.h | 12 +++++++++++-
arch/s390/kvm/pv.c | 8 ++++++--
2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 338845402324..913ccfaa9d76 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -99,6 +99,8 @@ enum uv_cmds_inst {
enum uv_feat_ind {
BIT_UV_FEAT_MISC = 0,
BIT_UV_FEAT_AIV = 1,
+ BIT_UV_FEAT_AP = 4,
+ BIT_UV_FEAT_AP_INTR = 5,
};

struct uv_cb_header {
@@ -159,7 +161,15 @@ struct uv_cb_cgc {
u64 guest_handle;
u64 conf_base_stor_origin;
u64 conf_virt_stor_origin;
- u64 reserved30;
+ u8 reserved30[6];
+ union {
+ struct {
+ u16 reserved : 14;
+ u16 ap_instr_intr : 1;
+ u16 ap_allow_instr : 1;
+ };
+ u16 raw;
+ } flags;
u64 guest_stor_origin;
u64 guest_stor_len;
u64 guest_sca;
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 899f3b8ac011..103add1894c9 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -561,12 +561,16 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
uvcb.conf_base_stor_origin =
virt_to_phys((void *)kvm->arch.pv.stor_base);
uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var;
+ uvcb.flags.ap_allow_instr = uv_has_feature(BIT_UV_FEAT_AP) &&
+ kvm->arch.model.uv_feat_guest.ap;
+ uvcb.flags.ap_instr_intr = uv_has_feature(BIT_UV_FEAT_AP_INTR) &&
+ kvm->arch.model.uv_feat_guest.ap_intr;

cc = uv_call_sched(0, (u64)&uvcb);
*rc = uvcb.header.rc;
*rrc = uvcb.header.rrc;
- KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x",
- uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc);
+ KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x flags %04x",
+ uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc, uvcb.flags.raw);

/* Outputs */
kvm->arch.pv.handle = uvcb.guest_handle;
--
2.40.1